Functions; Oversampling For Inputs - Siemens SIMATIC S7-1500 Manual

2.2

Functions

2.2.1

Oversampling for inputs

Function
Oversampling is defined as the transfer of data in constant bus cycle segments (sub-cycles),
whereby n sub-cycles correspond to one PROFINET bus cycle. The configured number n of
sub-cycles corresponds to one data cycle. Each sub-cycle reads in a measured value.
Oversampling is useful whenever you require acquisition of data with high time resolution but
without using an extremely short PROFINET bus cycle and thus fast CPU cycles.
With oversampling, a PROFINET bus cycle is divided into constant bus sub-cycles:
● One 16-bit value is read in per channel in each sub-cycle.
● The shortest possible sub-cycle is 62.5 μs.
● Sub-cycles are possible in increments of 2 to 16. The following applies here: Isochronous
data cycle / number of sub-cycles ≥ permitted sub-cycle duration (62.5 μs).
Typical areas of applications
Quality-monitoring measurements, for example when recording pressure trends during the
blowing process of PET bottle production.
Requirements
● Firmware version V2.1.0 or higher of the module.
● Isochronous mode has to be set.
Configuration
You configure the oversampling function by means of the sampling rate parameter.
Analog Input Module AI 8xU/I HS (6ES7531-7NF10-0AB0)
Manual, 12/2016, A5E03484886-AE
Product overview
2.2 Functions
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